National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Light Rain

64°F

18°C

Humidity 94%
Wind Speed N 6 mph
Barometer 29.88 in
Dewpoint 63°F (17°C)
Visibility 5.00 mi
Last update 22 May 4:45 pm CDT
Extended Forecast for

Marion IL

  • This Afternoon

    This Afternoon: Showers and possibly a thunderstorm. Steady temperature around 66. Northeast wind around 6 mph. Chance of precipitation is 80%.

    High: 66 °F

    Showers

  • Tonight

    Tonight: Showers and possibly a thunderstorm before 1am, then a slight chance of showers between 1am and 2am. Low around 60. North northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.

    Low: 60 °F

    Showers then
    Chance
    Showers

  • Saturday

    Saturday: Partly sunny, with a high near 81. Light west wind.

    High: 81 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A slight chance of showers, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 62. Calm wind. Chance of precipitation is 30%.

    Low: 62 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A chance of showers and thunderstorms before 7am, then showers likely and possibly a thunderstorm between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 82. Light and variable wind. Chance of precipitation is 60%.

    High: 82 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 63. Calm wind.

    Low: 63 °F

    Mostly Cloudy

  • Memorial Day

    Memorial Day: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 81. Calm wind becoming east northeast around 5 mph in the afternoon. Chance of precipitation is 30%.

    High: 81 °F

    Chance
    Showers then
    Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 65. Light east wind.

    Low: 65 °F

    Mostly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 80. Calm wind becoming east around 6 mph in the morning.

    High: 80 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
Showers and possibly a thunderstorm. Steady temperature around 66. Northeast wind around 6 mph. Chance of precipitation is 80%.
Tonight
Showers and possibly a thunderstorm before 1am, then a slight chance of showers between 1am and 2am. Low around 60. North northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 80%.
Saturday
Partly sunny, with a high near 81. Light west wind.
Saturday Night
A slight chance of showers, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 62. Calm wind. Chance of precipitation is 30%.
Sunday
A chance of showers and thunderstorms before 7am, then showers likely and possibly a thunderstorm between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 82. Light and variable wind. Chance of precipitation is 60%.
Sunday Night
Mostly cloudy, with a low around 63. Calm wind.
Memorial Day
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 81. Calm wind becoming east northeast around 5 mph in the afternoon. Chance of precipitation is 30%.
Monday Night
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 65. Light east wind.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 80. Calm wind becoming east around 6 mph in the morning.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 67. East wind around 5 mph becoming calm in the evening.
Wednesday
Showers and thunderstorms likely. Partly sunny, with a high near 83. South southeast wind 3 to 7 mph.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Southeast wind around 5 mph becoming calm in the evening.
Thursday
Showers and thunderstorms likely. Partly sunny, with a high near 83. Calm wind becoming east southeast around 6 mph in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.95°W
Last Update:
4:26 pm CDT May 22, 2026
Forecast Valid:
4pm CDT May 22, 2026-6pm CDT May 28, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation